Transmitter-arm.



No. 823,336. PATENTEJ JUNE 12, 1906. H. L. KNIGHT. TRANSMETTER 513M.

APPLICATION FILED 3131328, 1905.

UNITED STATES HERBERT -L.'KNIGHT,OF cI EvELAND; OHIO, As 'srenon To THE WILLIAMS- ABBOTT ELECTRIC coM -ANnoF CLEVELAND, 01110, A CORPORATION TRANSMITTER-ARM.

Specification of Letters Patent. Application filed July 28,1905. Serial No. 271,581.

Patented June 12,1906.

To all whom/ it may caneern:

Be i known that I, HERBERT L, KNIGHT, a

citizen of the United States of- America, and a resident of Cleveland, in the countyof Guyafieation, reference be' hoga, and State of Ohio,

have invented certain new anduseful I-m rovements in Transmitter-Arms, of which t e followin is a s peeihad to t e acc'o'm:

fpanyin'g drawings, forming a part'thereo'f.

My lnvention relates to improvements in supporting-arms for transmitters, .and has "for ll/S'ObjBGt tll'Q construction, of an arm' which is cheap to manufacture, simple, serv- -ij ceable, andone which avoids certam disadvantages present in similar devices now upon the, iiiarket. v

. bracket'orbase therefor,"although.not allot ao's'aid improvements are "limited to this emmg-offl'a bracket having two exterior ears hollow or tubularform, 1s pivotally-mounted at one end, whilg the other. end carries the gle sheet-steel stamping improvements are herein set forth as apphedtoa stamped transmitter-arm and hodiment o fm 'invention'.* I The device erelnshowncontammg n improvements may be descr bed as consistwherein the transmitter-arm, preferably of transmitter. .T-his arm-I may form of a sinor stampings, in

which case I interiorly reinforce it at its piv-- 'oted end in order to make the same ri 'd and improve vthe frictional engagement t ereof. To aid in this function,- I also mount within .--tjhe ears of the bracket dished washers which wherein I bear peripherally upon the arm at either side and hold it in adjusted position through ressure exerted bylmeans of a "transverse olt; This bolt referablyis provided with a feather 1; keywhich engages the washers and prei'vents themfrom rotating with the arm.

The details of theconstruction just'de-,

scribed will be .more readily gathered by making reference to the accom anylng draw 'ings, setting forth a transmltter-armcon-' structed in accordance with my invention,

Figure I is a view inside eleyation, partiallyPbroken away, 3 showing saldtransmit ,ter-arm mounted within, its bracket, together with one of the engaging washers and -the ljt fansverse pivot bolt.-- F1g.; II 1s a plan view,

a tubular re and'FigJIII a view in side elevation, of one of the dished Washers. Fig. IV shows the transverse bolt with its bmding-nuts. Fig. V is a view in vertical section on line 5 5 Fig. I, showing the mounting of the several parts by means of, the transverse bolt; and Fig. VI is a view in side elevation broken away, illustratin the transmitterfarm with attached transmitter removed from its support. v

Througheutthe drawings the same character of'reference is employed to designate simiterm the e telehone. Its inner end is provided with circuar flattened faces a, through-which extend the openings a, for receiving the pivot-bolt. At the other end of said arm small ears or cent to t e ivotalopening a is provide a orcing-plece t which surrounds the pivot-bolt-and stays the rear side walls of the transmitter-arm a. This part enables me to secure the necessary or desired rigidity at this oint, while makin the transmitterarm of 'ghter ga e materia than would otherwise be possib e with an armformed of;

I semiseam less/and as ordinan y mounted no opposing edges are apparent to theuser of t also partially i6, e stamping of sheet e abutted or and presentlugs t are'provided, whereb the transmitter t ma -.be secured upon t e arm; Ad'a+ a st'ampings and not interiorly reinforced. The I base or bracket b likewise may be made of a single stamping of sheet-steel, the same hav-- ing lateral ears I)" for receiving the plvoted transmitter-arm a. Transverse openings 6 extend throu h the said'ears and serve to accommodate t e ivot-bolt f.

' In order to h d the arm relatively rigid in its positions of angular adjustment within its bracket, I have provided the dished washers -'w w, which are inserted within the ears I) of the bracket 11 oneitherside of the arm a. These washers ear upon said arm only-admcent totheir outereriphery, thereby increasing the fi'icti'onalefi'eot upon the interiorly-reinforced arm, which in consequence is quite rigid The washers w are prevented from turning with the arm by means of the keys or feathersff, struck up near either end of the pivot-boltf, the said. bolt when assembling the structure readily passing through the openings 1), w, and'a, respectively,

provided in the ears of the bracket, the was the interior of'the arm is left free to carry the ers, and the transmitter-arm. The washers are sufficiently dished, however, to suitably space'the arm within the recessed ears I) of the bracket and position it centrally upon the bolt, so that it is free to move thereon as a pivot in a vertical plane. The keys or feathers f of the bolt, however, serve to secure t e washers against rotation within the ears of the bracket.

Upon the threaded ends of the bolt f are screwed the nuts n n, which bear against the ears I) of the base or bracket and which in 'turn engage the washers and force them tightly against the rear side portions (1 of the arm a, thereby frictionally engaging said arm and retaining it in its positions of angular adjustment within the bracket or base.v

In the structure described are combined advantages present in both the solid and stamped transmitter-arms of the art. Thus gage the transmitter-arm, thus making the construction of said bracket simpler and more sightly. Nevertheless the washers are securely held within the ears by the simple expedient ofusing a keyed or feathered bolt fitting correspondingly-shaped openings in the washers and embracing-ears. The use of the pivot-boltfpermits the frictional engagement of-the washers with the arm a to be adjusted' as desired merely by tightening or oosening the nuts n, while the frictional engagement is secured adjacent to the periphery of these washers in a manner which avoids such cramping or binding of the arm as to prevent or impede its immediate adjustment as required by the user of the telephone.

As intimated above, certain features of my invention are independent, and particularly the employment of the dished washers and coacting pivot-bolt are quite adaptable to constructions employing a solid or cast arm and base, although I have herein set forth my invention in its preferred form I desire to secure by these Letters Patent the following: I

1. The combination with a supportingbracket or base portion, of a reinforced and semiseamless transmitter-arm pivotally mounted therein, and means for frictionally engaging said arm to retain it in its positions of angular adjustment with respect to the base; the said arm being formed of a single stamping of sheet metal shaped with its edges abutting along its lower side, and having a reinforcing part interiorly inserted between the rear walls of said arm, substantially as set forth.

2. The combination with a supporting bracket or base, of a stamped or tubular};

transmitter-arm pivotally mounted therein, a tubular reinforcing part rearwardly inserted in said stam ed arm at its pivotal mounting, and interior y engaging its walls adjacent to said mounting and means for securing fric' tional engagement of the arm with its base or bracket, whereby it is securely held in its positions of adjustment, substantially as set forth. 4

3. In a supporting-arm for telephone-transmitters, the combination with a base or bracket, of a pivoted, vertically-adjustable arm mounted therein, stationarily-mounted dished washers provided at the pivotal mountin of said arm to secure the desired tween the said ears, washers interposed at' either side of said arm and between the ears of the bracket, and a transverse keyed or feathered binding-bolt adapted to secure the washers against movement with respect to one of the members of the pivotal mounting,

substantially as set forth. a

6. In a supporting-arm for telephonetransmitters, the combination with a stamped base or bracket having outwardly-extending ears, of a tubular or-stamped transmitterarm pivotally mounted between the said ears, a reinforcing artrearwardly inserted between the side waI is of the arm adjacent to the pivotal mounting, dished washers posi- 1905, in the presence of two subscribing wittioneqf alt; eittherkside ofithelaiarncll betfweelrli thg. nesses. ears 0 t e rac et, an a, eye or eat ere binding-bolt securing the washers against ro- HERBERT K3 IGHT' 5 tation with respect to the pivotal ears of said Witnesses:

bracket, substantially as set forth. JOHN F. MODONNELL,

Signed at Cleveland, this 27th day of July, ALBERT LYNN LAWRENCE. 

